Broonel Black Fine Point Digital Active Stylus Pen - Compatible With The Dell XPS 13 7390 13.3" 2-in-1 Laptop : Amazon.co.uk: Computers & Accessories
Dell XPS 15 2-in-1 review: I absolutely love it - Neowin
Active Stylus Pen Pn556w For Dell Xps 12 9250 Xps 13 9365 Xps 15 9575 Precision 5530 Venue 10 Pro 5055/5056 2-in-1 Tablet - Tablet Pen - AliExpress
Bought this XPS 13 9310 touch version 2 weeks ago and has these two pen model PN579x for the laptop. Found out the pen buttons are working fine but not the touch.